If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选

Perhaps the argument shouldn't be, "We have to believe in souls because no mere physical object could reason."

也许论证不应该是,我们必须相信灵魂,因为所有的物理对象都不能推理

耶鲁公开课 - 死亡课程节选

And we must know what the result is supposed to be. Typically when you run an experiment, you say, and I think the answer will be x.

这样我们可以来查看代码的进程,我们还必须清楚结果应该是怎么样的，比如当你运行一个实验的时候。

麻省理工公开课 - 计算机科学及编程导论课程节选

The SEC--you have to decide-- you hear about public companies and private companies.

证交会...你必须选择...,你应该听说过上市公司和私营公司

耶鲁公开课 - 金融市场课程节选

So, I said, okay, I didn't want to assume so we clicked senior and frankly it was then a dead end because apparently to get some senior discount you need to have some special pass or something like this that we didn't have and yet that certainly wasn't obvious here so now we together and this person in particular had to figure out how you go back and then restart this process.

我说，好的，我不希望揣测，所以我点击了老人票,然后问题就来了，因为似乎,需要特殊的号码之类的东西来购买老年票,但是我们没有,明显我们不应该走这步,现在我们一起必须找出,怎样返回，然后重新开始这个步骤。

哈佛公开课 - 计算机科学课程节选

You have to know where the vowels are supposed to go, and that makes it harder to learn how to read, but when you have the vowel sounds it's easier and the Greeks made that contribution.

你必须知道这些元音都应该加在哪,这使的学习阅读变得更加困难,但是如果填入元音,那么就会简单点,而希腊人在这方面做出了贡献

耶鲁公开课 - 古希腊历史简介课程节选

That means, when I take two derivatives, I want to get a, then you should know enough calculus to know it has to be something like at^, and half comes from taking two derivatives.

也就是说,当我想求二阶导时,得到了a,你应该有足够的微积分知识,才能知道必须有类似at^的项,而这个1/2则是因为求了两次导数

耶鲁公开课 - 基础物理课程节选

But now that we're here,we're in a position perhaps to raise the question, should we be asking what it takes to survive?

现在我们必须想要提出的问题应该是，要怎样才能生存？

耶鲁公开课 - 死亡课程节选

I think it's fairly clear that you don't need to appeal to souls in order to do that.

我想大家应该能非常清楚地看到,这样的诉求并非是必须的

耶鲁公开课 - 死亡课程节选